15th Ave S Improvements

Updated: October 21, 2020

What’s happening now?

We Are Here Timeline_Pre-Construction

Thank you to those who participated in our online drop-in session on Wednesday, October 14 to learn more about the construction set to start in early 2021.

  If you missed the event or would like to revisit the content, you can view the recorded presentation, materials, and the Q&A.

Questions about the project?

Email us at 15thAveAAC@seattle.gov or leave us a voicemail at (206) 775-8719.

Project Overview

15th Ave S between S Spokane St and S Angeline St is a two-way arterial serving southeast Seattle. This stretch of road provides an important connection for people traveling between Beacon Hill and Rainier Valley. SDOT wants to ensure that these improvements contribute to a safer space for all travelers, and balance the needs of all modes of transportation, so that everyone can get where they need to go safely and conveniently.

In 2021, we'll repave about 1 mile of 15th Ave S between S Spokane St and S Angeline St and a section of S Spokane St between S Columbian Way and 18th Ave S.

In addition to paving, we'll make improvements at the 15th Ave S and S Columbian Way intersection. These improvements include a new pedestrian-friendly peninsula and updated roadway striping. Contrary to earlier plans, we're not building a plaza and the left turn signal at S Oregon St and 15th Ave S will remain. For more details about the improvements at this intersection, please see the maps below.

Project AreaMap showing 15th Ave S and S Columbian Way intersection (after improvements).

15th Ave S and S Columbian Way before and after
(Click to enlarge) Details of 15th Ave S and S Columbian Way intersection improvements

The scope of this project includes:

  • New pavement: This will extend the life of the pavement, making the roadway safer and smoother for travel
  • Drainage improvements: Improving drainage in the area will extend the life of the roadway and make the streets safer and smoother to use
  • Slip lane: This project will improve the slip lane (the right-turn-only lane) at 15th Ave S and S Spokane St
  • Upgraded pedestrian push buttons: We'll update push buttons in select locations to meet Americans with Disabilities Act (ADA) standards
  • Upgraded curb ramps: In select locations, we'll update curb ramps to meet ADA standards
  • Improved and updated sidewalks: We'll repave select sidewalks in need of repair
  • Improvements at 15th Ave S and S Columbian Way intersection: We'll install a pedestrian-friendly peninsula, new curb bulbs, and improved connections for bicycles.

Below are images of the project area. The first depicts a crosswalk at the 15th Ave S and S Columbian Way intersection that we'll shorten during this project. The second shows roadway damage along 15th Ave S that we'll repave.

Photo showing current configuration of pedestrian island at the intersection of 15th Ave S and S Columbian Way.
Current configuration: pedestrian island at the intersection of 15th Ave S and S Columbian Way. 

Image showing roadway damage on 15th Ave S.
Roadway damage on 15th Ave S.

Project Background

Each year, we pave arterial streets in poor condition to make them safer, smoother, and to extend their useful life. We prioritize paving projects based on pavement condition, traffic volume, geographic equity, cost, and opportunities for grants or coordination with other projects in the area. Paving streets also creates opportunities to improve street safety and move people and goods more efficiently in a growing Seattle. Read more about our current paving projects here.

Get involved

Here are some ways to get more information about the project:


This is our anticipated project timeline, but dates are subject to change.

Early 2020
Complete final design

Summer and Fall 2020
Pre-construction coordination with community

Early 2021
Begin construction

Complete construction


Levy to Move SeattleFunding comes from the 2015 voter-approved, the 9-year Levy to Move Seattle, which provides funding to improve safety for all travelers, maintain streets and bridges, and invest in reliable, affordable travel options for a growing city.

This project is also receiving funding from SDOT's Safe Routes to School program, which makes it easier and safer for students to walk and bike in Seattle, as well as funding from our paving program.

Outreach to Date

Fall 2019
Outreach to community to share information and collect input.

Winter 2020
Preconstruction open house 


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